The closest unstable equilibrium point method for power system dynamic security assessment

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · IEEE (Institute of Electrical and Electronics Engineers) Transactions on Circuits and Systems; (USA)

DOI:https://doi.org/10.1109/31.34664· OSTI ID:5274732

Chiang, H D; Thorp, J S ^[1]

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1. Cornell Univ., Ithaca, NY (USA). Dept. of Electrical Engineering

The closest unstable equilibrium point (closest u.e.p.) method is an important tool for problems associated with power system dynamic security assessment. In this paper the authors study the closest u.e.p. method from both theoretical and computational points of view. Issues regarding the existence and uniqueness of the closest u.e.p. are investigated. A dynamical characterization of the closest u.e.p. is derived, and the problem concerning its robustness with respect to changes in different parameters of a power system is studied. This robustness property highlights the practical applicability of the closest u.e.p. method to power system dynamic security assessment. An improved closest u.e.p. method is proposed based on theoretical results which uses a reduced model approach and is shown to be optimal, in the sense that the estimated stability region characterized by the corresponding energy function is the largest one within the entire stability region. Examples are given to illustrate the robustness of the closest u.e.p. and the improved closest u.e.p. method.

• OSTI ID: 5274732
• Journal Information: IEEE (Institute of Electrical and Electronics Engineers) Transactions on Circuits and Systems; (USA), Journal Name: IEEE (Institute of Electrical and Electronics Engineers) Transactions on Circuits and Systems; (USA) Vol. 36:9; ISSN 0098-4094; ISSN ICSYB
• Country of Publication: United States
• Language: English

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